Multiple cycle dishwashing machine



July 4, 1961 Filed Nov; 29, 1959 D. 8.. CUSHING 2,990,835

MULTIPLE CYCLE DISHWASHING MACHINE 2 Sheets-Sheet 1 .=il j INVENTOR.

DONALD. S. GUSHING F l G.

"gi WM HIS ATTORNEY CAM YCLE ALTERNATE CONTRGL A. 53 r July 4, 1961Filed NOV D. S. CUSHING MULTIPLE CYCLE DISHWASHING MACHINE F'IGZ 2Sheets-Sheet 2 SWITCH MOT R 35 WATER 3 VALVE PUMP WASH

HEATER RES ET INV EN TOR CUSHING WWW HIS

DONALD S.

ATTORNEY United States Patent Filed Nov. 20, 1959, Ser. No. 854,501 6Claims. (Cl. 134-58) This invention relates to washing machines, andmore particularly to a dishwasher including a control circuit providingfor four diiferent manually selectable cycles.

It is becoming increasingly desirable in the dishwasher art to provideseveral alternative operating cycles of the dishwasher, each appropriatefor 'a different type of load to be washed. For instance, a typicalcycle of operation for the average conventional load of dishes whichincludes silverware, chinaware, glasses, and perhaps some cookingutensils may provide, for instance, two preliminary rinses, a washingoperation, three subsequent rinses, and a full drying cycle after thelast rinse. However, where the load is a similar one but fewer articlesare to be washed it may well be desirable to have a full cycle but tohave .a substantially smaller amount of water provided for the rinsingand washing operations. Other alternative cycles which are desirable forparticular items might include, for instance, a cycle wherein thearticles are only washed, then rinsed and treated with a short dryingcycle; this would be appropriate in the case where only cooking utensilsare to be washed. This type of cycle is also appropriate for finechinaware and crystal when a smaller amount of water is provided, andthis constitutes a fourth type of cycle.

It is inevitable that the provision of a multiple selection of cycles,as opposed to a single cycle, must increase the complexity of thecontrol system of the machine and therefore its expense. It is, however,most desirable to restrict this increased expense and complexity to aminimum.

It is, consequently, a principal object of this invention to provide adishwasher having multiple cycles wherein the conventionaltimer-operated switches are arranged in a particular circuitrelationship with manually operated selector switches so that, althoughone single cycle length is provided by the usual sequence controlmechanism, the length of operation of the diiferent components of thedishwasher is varied by the varying relationship of the manual switchesand the timer operated switches.

A further object of the invention is to provide a circuit of the typedescribed where at least the motor driving the washing means has thelength of its operation controlled in this manner.

Yet another object of the invention is to provide control of theoperation of other components such as the water supply means and theheat drying means in this manner.

A further more specific object of the invention is to achieve thedesired control by causing the manual selector means to permitengagement of the energizing circuits for the components to dillerenttimer switches, the timer closing these switches for different lengthsof time during an operation so that the components operate for dilferentlengths of time although the length of the total cycle, as timed by thesequence control means, remains the same.

Another more specific object of the invention is to achieve furthercontrol over the operation of the water control means by providing amanual switch which makes the water control means either dependent orindependent of the energization of the motor. In such a case it will beclear that where the water control means is independent of the motorenergization it may be energized for longer ice periods than where it isdependent upon motor energization.

A further specific object of the invention is to provide a dishwasher ofthe type described in which a lid interlock is provided, so that afterthe cycle has been terminated, and when the lid is opened, the sequencecontrol means will be caused to advance to its starting position, inreadiness for a subsequent dishwashing operation.

Briefly stated, in accordance with one aspect of this invention, Iprovide a washing machine having an automatic washing. cycle in which aconventional tub is pro vided together with washing means within the tuband water means for introducing water into the tub. The washing means isdriven by a suitable electric motor, and the water means is controlledby a suitable electric control means (conventionally a solenoid) which,when energized, causes the water means to introduce water to the tub.The usual sequence control means is provided, together with suitableenergizing circuits for the motor means, the water control means and thesequence control means. The sequence control means controls first andsecond switch means which it closes for different periods of time with,however, the limitation that at least one of the two switch means heclosed at any one time during the washing cycle. Throughout each fullcycle the sequence control means circuit is connected across a source ofpower through at least one of the switch means, and at the end of eachcycle the sequence control means opens both switch means.

In cooperative relation with the two switch means, I provide a manualswitch which has at least one operative position in which it connectsboth the motor means circuit and the water control means circuit to afirst of the switch means. When the manual switch is not in itsoperative position it disconnects the motor means circuit and the watercontrol means circuit from the first switch means. Together with this, Iconnect the motor means circuit and the water control means circuit byany suitable means to the second of the switch means at least duringtimes when the manual switch is out of the operative position.

With the above mentioned construction the sequence control means operatethroughout a cycle to toll out the cycle. However, the extent to whichthe other energizing circuits are completed to cause operation of thecomponents controlled thereby is dependent upon the position of themanual switch, that is, the manual switch determines which of the twoswitch means will be the controlling one for determining the length ofthe operation of the component.

As a further improvement, another manual switch may be used to determinewhether the water control means circuit completion is dependent on themotor means circuit completion. This causes varying amounts of water tobe introduced into the machine, the greater amount being provided whenthe water control means circuit is independent of the motor meanscircuit.

The subject matter which I regard as my invention is particularlypointed out and distinctly claimed in the concluding portion of thisspecification. My invention, however, both as to organization md methodof operation, together with further objects and advantages thereof, maybest be under-stood by reference to the following description taken inconjunction with the accompanying drawings.

In the drawings,

FIGURE 1 is a front elevational view, with some of the parts brokenaway, of a dishwasher embodying the present invention;

FIGURE 2 is a schematic electrical wiring diagram illustrating a controlsystem for the machine which embodies my invention in one form thereof;and

FIGURE 3 is a sequence control cam chart illustrating the sequence ofoperation of the schematically shown switches of FIGURE 2.

Referring now to FIGURE 1, there is shown a dishwasher 1 having anenclosed washing compartmentor tub 2 of generally rectangularconfiguration in Which' are mounted an upper rack 3 and a lower rack 4arranged to support dishes or the like during washing operations.Dishwasher 1 is provided with a water inlet valve 5 adapted to beconnected to a water supply system, a water inlet conduit 6, and a fillfunnel 7 communicating with the interior of tub 2. Located at the bottomof the tub 2 and arranged to circulate washing fluid throughout thewashing compartment is a rotary impeller 8. A drain pump 9 having aninlet communicating with tub 2 and an outlet connected to drain conduit10 is supported beneath the tub, the housing of pump 9 being arranged tosupport an electric motor 11 which drives the impeller 8 so as tocirculate the fluid in the tub when rotating in one direction,

and to operate pump 9 so as to discharge fluid through A conduit 10 whendriven in the other direction. This washing impeller and drain pumparrangement is the invention of Russell M. Sasnett and Lauren W. Guthand is more fully described in application Serial No. 671,070, filedJuly 10, 1957, now Patent Number 2,959,179, and assigned to the assigneeof the present application.

Automatic operation of dishwasher 1 to provide a complete dishwashingand drying cycle is effected by a sequence control assembly, generallyindicated by the nu meral 12, which is arranged to control theenergization of a solenoid 13 in turn controlling inlet valve 5 and tocontrol the energization of motor 11. The sequence control assembly mayalso be used to control the actuation of a rinse agent dispensing means14 and a detergent dispensing means (not shown). Timer 12 includes aswitch actuating rotary cam assembly 15 driven by a constant speed motor16, such devices being Well known in the art.

Tub 2 has a top access opening which is closed by a hinged top cover 17during washing operations, being held in closed position by a latchmechanism 17a. This cover latch mechanism is disclosed and claimed inPatent 2,896,641 issued on July 28, 1959, to Melvin R. Kaufiman and JohnA. Dicken, Jr. and assigned to the assignee of the praent application.At the front of the machine there is provided in a convenientlyaccessible position a group of four manually operated buttons 18, 19, 20and 21 which are used to select the desired type of operating circuitembodying my invention. It will be understood that, besides thecomponents specifically shown, other electrically controlled componentsof the machine, such as suitable indicating lights, and detergent andrinse agent dispensers, will also generally be controlled electrically;these other components have been left out of FIGURE 2 only in order toshow clearly the invention without confusing additional details which donot form a part thereof. The entire circuit is energized through a pairof supply conductors 22 and 23 across a suitable source of power (notshown) such as the conventional 110 volt 6O cycle source generallyavailable. Conductor 22 connects with a v switch 24 (also shown inFIGURE 1) which, when the cycle as will be more fully described inconnection with FIGURES 2 and 3.

As will also be more fully described in connection with FIGURES 2 and 3,the typical full operating cycle of dishwasher 1 includes a number ofrinsing, washing, and drying steps; for instance, the full cycle willinclude:

(1) A preliminary rinse in which the inlet valve 6 is opened to admit apredetermined quantity of water into the tub 2, impeller 8 is rotated bymotor 11 for a short period of time (two minutes, for example) tocirculate water in the tub, and finally motor 11 is reversed so as tooperate drain pump 9 and discharge the first charge of washing fluidfrom the ub.

(2) A second preliminary rinse in which step (1) is repeated.

(3) A washing step similar to steps 1) and (2), except that detergent isintroduced into the water at the beginning of the step and the water iscirculated in the tub for a somewhat longer period of time (five or sixminutes, for example).

(4) At least one and preferably three rinse steps similarto step (1).

(5) A drying step of predetermined length in which suitable heatingmeans is energized to cause evaporation of the moisture on the dishesand consequent drying thereof.

Referring now to FIGURE 2, there is shown a control cover is closed, isactuated into engagement with a contact 25 and when the cover is openengages a contact 26. Contact 25 in turn is connected to a movablecontact 27 by a suitable cam 28 which, together with cams 29, 30, 31 and32 is driven by the timer motor 16. While the cams are shown only inoutline in FIGURE 2, a development of the peripheries of the cams isshown in FIGURE 3 to indicate the sequence in which they open and closethe switches and will be fully described herebelow.

Contact 27 is part of a switch 33 which is controlled by the rotation ofcam 28. In the same manner, the rotation of cams 29, 30, 31 and 32controls respectively the operation of timer switches 34, 35, 36 and 37.Cam 28 has a portion of its periphery formed so that the three contacts27, 38 and 39 of switch 33 are all separated, a second portion in whichcontact 27 engages contact 38, and a third portion in which contact 27engages contact 38 and depresses it so that all three contacts 27, 38and 39 are in engagement. Cam 29 has three positions: as shown, themovable contact 40 and 40a may engage neither of the contacts 41 and 42;in addition, a second position causes contact 40 to engage contact 41and a third position causes contact 40a to engage contact 42. In switch35, the movable contact 43 may be caused to engage stationary contact44. Similarly, in switch 36 the movable contact 45 may be caused toengage the stationary contact 46. In the last switch 37, the movablecontact 47 may engage either contact 48 or contact 49.

Contact 38 of switch 33 is connected through a conductor 50 to the timermotor '16 which in turn is connected directly to supply conductor 23. Itwill be seen that an energizing circuit for timer motor 16 is thusprovided from conductor 22 through switch 24 and contact 25, and thenthrough contacts 27 and 38 of switch 33, and conductor 50, to timermotor 16 which is then connected through to conductor 23.

The contact 38 is also connected through a conductor 52 to a contact 53of a manually operated switch generally indicated at 54. Switch 54 alsoincludes a contact 55; the switch has an operative position in whichcontacts 53 and 55 are together and an open or inoperative position inwhich they are separated, as shown. Switch 54 is one of two manuallyoperated sets of contacts, the other one being a switch 56 having amovable contact 57 which is engageable either with a contact 58 or witha contact 59. Both switches 54 and 56 are controlled by buttons 18, 19,20 and 21 through conventional commercially available linkage mechanismswhich, to enhance the clarity of the invention, are not shown hereon.Depression of button 18 closes switch 54 and causes engagement ofcontact 57 with contact 58 of switch 56. Depression of button 19 closesswitch 54 but causes engagement of contact 57 with contact 59.Depression of button 20 leaves switch 54 Open and causes engagement ofcontacts 57 and 58. Depression of button 21 leaves switch 54 open andcauses engagement of contacts 57 and 59.

Contact 55 is connected through a conductor 60 to contact 39 of switch33, through a conductor 60a to contact 40 of switch 34, and by aconductor 61 to contact 53 of switch 56. In addition, the contacts 55and 58 are connected by a conductor 62 to contact 44 of switch 35. Thecontact 59 of switch 56 is connected by a conductor 63 i of the line 23.

to conductor 64 which in turn is connected to contact 43' of switch 35.It will thus be seen that the two contacts 58 and 59 are connected toopposite sides of the switch 35.

From contact 57 a connection is made through a conductor 65 and switch36 to the solenoid 13 which con trols inlet valve 5, and then acrosstoconductor 23. The conductor 64 extends through a conventional motoroverload protector 66 to the motor 11. The motor includes a relay havinga coil 67 in series with the main winding 68 of the motor, and when therelay coil is energized it pulls up a contact 69 to complete a circuitfor the two alternatively used start windings 7 and 71 of the motor.Winding 70 is connected to contact 48 of switch 37 while Winding 71 isconnected to contact 49; With this arrangement, the movable contact 47of the switch is effective to connect either one or the other of the twostart windings 7t) and 71 through conductor 72 to the supply conductor23. It will, of course, be understood that, in the conventional manner,the relay coil 67 is energized by the relatively high starting currentpassing through the main winding 68 of the motor, and that the ordinaryrunning current of the motor is insuflicient to keep the coil 67energized so that contact 69 is engaged for the starting of the motorand then drops out as the motor comes up to speed.

Completing. the description of the circuit connections, the contact 41of switch 34 is connected to a conventional electrical resistanceheating element 73 which is connected at its other side to the conductor23. Also, the contact 26 of the cover switch 24 is directly connected tothe contact 42 of switch 34, and contact 40a is connected through aconductor 74 to conductor 50 to provide an additional timer motorcircuit which may be completed only when switch 24 engages contact 26.

The operation of the dishwasher as controlled by the circuit of FIGURE 2will now be described having particular reference to FIGURE 2 inconjunction with FIG- URE 3. The selection of the desired cycle is madeby the depression of one of the buttons 18-21. It will be assumed forthis initial description that button 18 has been depressed, therebyclosing switch 54 and causing engagement of contact 57 with contact 58.Reference to FIGURE 3 shows that now, when the lid 17 is closed to causeengagement of contact 24 with contact 25, the only contacts initiallyclosed by the action of the timer motor will be contacts 47 and 48 ofswitch 37 and contacts 27 and 38 of switch 33. The engagement ofcontacts 27 and 38 completes the circuit previously described throughthe timer motor to start operation of the timer motor to cause rotationof the cams controlled thereby. After the cams have been rotated for avery brief period, cam 30 closes contacts 43 and 44 of switch 35, andcam 31 closes switch 36. An energizing circuit for the motor 12 is thencompleted, starting with contact 38 through con.- ductor 52, switch 54,conductors 61 and 62, switch 35, and conductor 64 to the motor itself.In the motor the circuit is completed through the relay coil 67, mainwinding 68, and-because of the position of contact 47- through startwinding 70 but not through start winding 71. The polarity of startwinding 70 relative to main winding 68 is such as to cause the motortostart rotating in a direction to produce a washing action by theimpellers 8. As the motor comes up to speed, as has been described,relay contact 69 drops out to de-energize the start winding 76 so thatthe motor continues operation on winding 68 alone.

A circuit is also completed, starting at conductor 61, through contacts58 and 57 of switch 56, conductor 65, switch 36 and through the solenoid13 to the other side Thus, simultaneously with the starting of theoperation of the motor, the washing fluid, con ventionally hot water, isintroduced through valve by the energization of solenoid 13. Thecombined action of the solenoid 13 and of the motor 1 1 causes water tobe impelled against the dishes held in the racks 3 and 4 of the machineso as to effect a first rinsing action. The water, of course, ceases tobe introduced when the switch 36 opens, with the action of the impellercontinuing to the end of the rinse operation.

At the end of the rinse operation the cam 30 causes switch 35 to open,and the cam 32 moves contact 47 to switch 37 over into engagement withcontact 49. The motor at this time stops because there is no completionof an energizing circuit for it with switch 35 open. After a pause, theswitch 35 recloses. Because of the connection of start winding 71through an energizing circuit, the motor starts up in the oppositedirection to pump out the water in the machine. This pumping actioncontinues until the reopening of switch 35.

After the major part of the water has been removed by the pumpingaction, switch 35 is again opened to stop the motor and the position ofcontact 47 of switch 37 is again reversed. At the same time, switch 36is closed to start the introduction of water into the tub. Now, when theswitch 35 is closed again after a pause, the same rinse action aspreviously provided will take place followed in sequence by a pumpingaction and a pause during which water is again brought in byenergization of solenoid 13 through switch 36. After these twopreliminary rinses a washing operation, which is conducted in the samemanner as the rinsing operations, is provided. The washing operation isthe same as the rinsing operations with the single exception that it isconducted for a longer period of time, generally on the order of sixminutes as opposed to about two minutes for each rinse operation, andthat detergent is introduced into the machine at this time, this featurebeing completely conventional in nature and not being described hereinsince it is not a part of the applicants invention.

At the end of the washing operation a pause and then a pumping operationare provided in the same manner as before, three rinses similar to thefirst rinses then follow the washing operation. It will be seen that foreach of the rinsing operations and for the washing operation the watervalve is operated so as to provide a predetermined amount of water intothe machine.

At the end of the pumping operation following the last rinse the motorswitch 35 is opened for the remainder of the cycle. At this point thecam 29 moves contact 40 into engagement with contact 41 to energize theresistance heater element 73 and provide a drying operation. It willreadily be seen that the energizing circuit for resistance heaterelement 73 proceeds from contact 38 through conductor 52, switch 54 andconductor 60a to contact 40 and then from contact 41 through theresistance element to supply conductor 23. This action continues for apredetermined time until the end of the cycle is reached, at which timecam 29 moves contact 40 out of engagement with contact 41 to break theenergizing circuit for the heater element, and causes the contact 40 toengage contact 42. Also, contact 27 is disengaged from contact 33 tostop the operation of the timer motor and remove power from allcomponents.

At this point the articles in the dishwasher are clean, dry, and readyto be removed by opening the lid 17. When the lid is opened switch 24engages contact 26. At this time, contacts 40a and 42 are in engagementby the action of cam 29, and an energizing circuit is completed fromsupply conductor 22 through switch 24, contact 26, contacts 42 and 40a,conductors 74 and 50, and the timer motor 16 to supply conductor 23 toenergize the timer motor. The timer motor runs the cams around to theirstarting position in readiness for another cycle, at which point thetimer motor separates contacts 40a and 42 to de-energize itself so thatthe entire machine is de-energized.

It will be seen from the foregoing'that a complete dishwashing cycle,including two rinses, a wash, three '7 rinses, and a drying operation,is provided by the sequence set forth above.

Let it now be assumed that a full length cycle including all the rinsesand full drying time is desired, but that because a smaller quantity ofarticles are to be washed less water will be necessary. In this case,button 19 is depressed which, as explained before, causes switch 54 tobe closed and contact 57 of switch 56 to engage contact 59. Theoperation of the timer motor, the driving motor, and the heater isidentical to that described hereabove. However, it will be noted thatthe energizing circuit for solenoid 13, which must pass through contact57, is now routed through contact 59, conductors 63 and 64, switch 35and conductor 62 to conductor 61 rather than directly from contact 57through contact 58 to conductor 61. In effect, this makes theenergization of the solenoid dependent upon the completion of theenergizing circuit for the driving motor since the switch 35 whichcontrols the driving motor must be closed before the energizing circuitcan be completed for the solenoid 13.

Referring to FIGURE 3, it will be observed that the closing of theswitch 36 which controls the water valve is, in part, concurrent withthe pauses which are provided between pumping and rinsing operations bythe opening of switch 35. In the previous circuit, since theenergization of solenoid 13 was independent of switch 35, water wasintroduced during this period to provide a substantial total quantity ofwater. However, with the contact 57 engaging contact 59, water can enteras a result of the energization of solenoid 13 only when switch 35 isclosed. This will, of course, mean that despite the closing of switch 36the water will start to enter only when switch 35 closes and that asubstantially smaller quantity of water will be provided than would havebeen the case if water had been entering during the pause. Thus, bymanually making the water valve solenoid energization either dependentor independent of the motor energization, the amount of water may bevaried: when the solenoid energization is independent of the motor asubstantially greater quantity of water is provided for washing a fullload, and when the solenoid energization is dependent upon the motorenergization a substantially smaller quantity of water is provided forwashing smaller loads.

It has been found that the elimination of the two preliminary rinses isdesirable in certain instances, as, for example, where pots and pans areto be washed. In such cases, it is desired to provide only the washingoperation followed by the three rinses as described above. Asubstantially smaller amount of drying has been found to be desirablewhen such articles are washed. Where a cycle of this type is desired,the machine operator, after introducing the articles to be washed, willdepress button 20. As explained previously, this opens switch 54 andcauses switch 56 to have contacts 57 and 58 engaged. In this type of acycle the initial closing of contacts 27 and 38 energizes the timermotor 16 through the previously described circuit. However, becausecontact 38 is connected in circuit with the motor 11 and solenoid 13only through switch 54, the fact that this switch is opened prevents anyother action within the dishwasher except the tolling by the timer. Whenthe timer has rotated the cams past those portions which could providethe two preliminary rinsing and pumping operations, the cam 28 forcescontact 27 down further so that contacts 27, 38 and 39 are all inengagement with each other. At this point, a circuit is completed fromthe conductor 22 through switch 24, contact 25, contacts 27, 38 and 39to conductors 60 and 61 so as to bypass the switch 54.

Because of this, switch 54 is no longer necessary to the energization ofthe components of the machine once the energizing circuit passes throughcontact 39 of switch 33, and the machine starts into the washingoperation and the filling operation as a result of the energization ofmotor 11 and solenoid 13 in the same manner as described in connectionwith the first full cycle. The operation then proceeds precisely as inthe first full cycle so long as switch 33 causes the necessary circuitsto be completed through contact 39. After a relatively short period ofdrying the switch 33 moves contact 27 back so that it remains inengagement with contact 38 but so that contact 39 is separatedtherefrom. This then opens the energizing circuits to the componentssuch as the motor 11 and the solenoid 13, while nonetheless keeping thetimer motor energized as previously described. As a result, the timermotor continues to toll out the cycle without any action within thedishwasher until the end of the cycle is reached. It will be seen thatwith this cycle, by the cooperation of the timer switches and themanually operated switches, a short cycle is provided which eliminatestwo rinses and part of the drying operation. Part of switch 33 iselfective to keep the timer motor 16 energized throughout the cyclewhile at the same time, because of the open condition of switch 54, theswitch 33 is also used to eliminate part of the full cycle.

A fourth type of cycle for fine crystal and china is generallydesirable; this fourth type of cycle is quite similar to the third cyclejust described in that it should be short, with the first two rinseseliminated and with only a relatively brief period of drying. It is,however, desirable to provide substantially less water for this type ofcycle since delicate articles may be adversely affected by heavy amountsof water being dashed against them and since the food particles clingingthereto are normally not as securely fastened to them as in the case ofpots and pans.

When this fourth type of cycle is desired, button 21 is depressed. Thedepression of button 21 leaves switch 54 open but moves contact 57 ofswitch 56 over into engagement with contact 59, thereby once againmaking the energization of the valve solenoid dependent upon the closingof the motor switch 35. The fact that switch 54 is open means that ashortened cycle will be provided as described for the third cycle.However, this will be modified by the fact that substantially less waterwill be provided because of the fact that the solenoid 13 can beenergized only during the periods of operation of the motor and ofclosure of its own switch 36. Thus, this cycle is similar to the thirdcycle with the exception that substantially less water is provided bythe cooperative action of the motor switch, the manual switch and thevalve solenoid switch.

It will be seen from the foregoing explanation of the operation of thecontrol system of my improved dishwasher that I achieve four difierentcycles each provided by the operation of a single manually operatedbutton. The control over the length of operation of the motor isachieved by placing in series with the motor energizing circuit (whichincludes conductors 61 and 62, switch 35, conductor 64, and all themotor operating parts including motor protector 66, over to conductor23) a manually operated switch (switch 54) which selects one of twodifferent timer operated switch arrangements (contacts 27 and 38, andcontacts 27, 38 and 39) through which the motor is to be energized, theconnection to the motor circuit passing from contact 38 throughconductor 55 and switch 54 in one case, and in the other case passingfrom contact 39 through conductor 60. In the case of one of the switcharrangements, de-energization is for one period of time and in the caseof the other of the switches it is for a different period of time. Itwill further be seen that I achieve variable amounts of water in thedifferent cycles by either causing the energizing circuit for the valvesolenoid (the circuit starting at conductor 23, and passing through thesolenoid 13, switch 36, conductor 65, and contact 57 of switch 56, andthen passing alternatively either through contact 58 and conductor 61 toconductor 60 or else through contact 59 and conductor 63 to conductor64) to bypass the motor switch or to extend in serieswith it so that inthe first case the energization of the valve solenoid is independent ofmotor operation and in the second case it is dependent upon motoroperation.

While in accordance with the patent statutes I have described what atpresent is considered to be the preferred embodiment of my invention, itwill be obvious to those skilled in the art that various changes andmodifications may be made therein without departing from the invention,and I therefore aim in the appended claims to cover all such changes andmodifications as fall within the true spirit and scope of the invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. A washing machine for providing an automatic washing cyclecomprising: a tub; washing means within said tub arranged to effectwashing of articles placed in said tub; water means for introducingwater into said tub; electric motor means connected to said washingmeans and effective when energized to operate said washing means;electric water control means controlling said water means and eifectivewhen energized to cause introduction of water to said tub; sequencecontrol means; energizing circuits for said motor means, said watercontrol means, and said sequence control means respectively; a switchassembly including first and second switch means controlled by saidsequence control means and closed thereby for different periods of time,at least one of said switch means being closed at any one time duringsaid cycle, said sequence control means circuit being connected across asource of power through said switch assembly throughout said cycle andopening both said switch means at the end of said cycle; a manual switchhaving at least one operative position, said manual switch connectingsaid motor means circuit and said water control means circuit to a firstof said switch means in said operative position and disconnecting saidmotor means circuit and said water control means circuit from said firstswitch means when out of said operative position; and means connectingsaid motor means circuit and said water control means circuit to thesecond of said switch means at least during the period when said manualswitch is out of said operative position.

2. A washing machine for providing an automatic washing cyclecomprising: a tub; washing means within said tub arranged to effectwashing of articles placed in said tub; water means for introducingwater into said tub; electric motor means connected to said washingmeans and effective when energized to operate said washing means;electric water control means controlling said water means and effectivewhen energized to cause introduction of water to said tub; sequencecontrol means; energizing circuits for said motor means, said watercontrol means, and said sequence control means respectively; first,second, third and fourth switch means controlled by said sequencecontrol means and closed thereby for different periods of time, saidfirst and second switch means forming a switch assembly, at least one ofsaid first two switch means being closed at any one time during saidcycle, said sequence control means circuit being connected across thesource of power through said switch assembly throughout said cycle andopening both said first and second switch means at the end of saidcycle, said third switch means being in said motor means circuit andcontrolling completion thereof, said fourth switch means being in saidelectric water control means circuit and controlling completion thereof;a manual switch having at least one operative position, said manualswitch connecting said motor means circuit and said water control meanscircuit to said first switch means in said operative position anddisconnecting said motor means circuit and said water control meanscircuit from said first switch means when out of said operativeposition, and means connecting said motor means circuit and said watercontrol means circuit to said second switch means at least during theperiod when said manual switch is out of said operative position.

3. The apparatus defined in claim 2 wherein one of said first and secondswitch means is closed throughout said cycle and the other of said firstand second switch means is closed only during part of said cycle.

4. A washing machine for providing an automatic washing cyclecomprising: a tub; washing means within said tub arranged to effectwashing of articles placed in said tub; water means for introducingwater to said tub; electric motor means connected to said washing meansand effective when energized to operate said washing means; electricwater control means controlling said water means and effective whenenergized to cause introduction of water to said tub; sequence controlmeans; energizing circuits for said motor means, said water controlmeans, and said sequence control means respectively; first, second,third and fourth switch means controlled by said sequence control meansand closed thereby for different periods of time, said first and secondswitch means forming together a switch assembly, at least one of saidfirst two switch means being closed at any one time during said cycle,said sequence control means circuit being connected across a source ofpower through said switch assembly throughout said cycle and openingboth said first two switch means at the end of said cycle; a firstmanual switch having at least one operative position, said manual switchconnecting said motor means circuit and said water control means circuitto said first switch means in said operative position and disconnectingsaid motor means circuit and said water control means circuit from saidfirst switch means when out of said operative position; means connectingsaid motor means circuit and said water control means circuit to theother of said first two switch means at least during the period whensaid first manual switch is out of said operative position, and a secondmanual switch having first and second operative positions, said thirdswitch means being in said motor means circuit, said fourth switch meansand said second manual switch being in said water control means circuit,said water control means circuit being in series with said third switchmeans in said first operative position of said second manual switch,said water control means circuit being in parallel with said thirdswitch means in said second operative position of said second manualswitch.

5. A washing machine for providing an automatic washing cyclecomprising: a tub; washing means within said tub arranged to effectwashing of articles placed in said tub; water means for introducingwater to said tub; electric motor means connected to said washing meansand effective when energized to operate said washing means; electricwater control means controlling said water means and effective whenenergized to cause introduction of water to said tub; sequence controlmeans; energizing circuits for said motor means, said water controlmeans, and said sequence control means respectively; first, second, andthird switch means controlled by said sequence control means and closedthereby for different periods of time, said first switch means beingclosed throughout said cycle, said sequence control means circuit beingconnected across a source of power through said first switch meansthroughout said cycle and opening said first switch means at the end ofsaid cycle, said second switch means being included in said motor meanscircuit and completing said circuit when closed, said third switch meansbeing included in said water control means circuit and completing saidwater control means circuit when closed; a manual switch having twooperative positions and being included in said water control meanscircuit, said manual switch casing said water control means circuit tobe connected in series with said second switch means in said firstoperative position of said manual switch, said manual switch causingsaid water control means circuit to be in parallel with said secondswitch means in said second operative position, and means connectingboth said motor means circuit and said water control means circuit tosaid first switch means.

6. A washing machine for providing an automatic washing cyclecomprising: a tub; movable closure means enclosing said tub in oneposition and providing access to said tub in a second position; washingmeans within said tub arranged to effect washing of articles placed insaid tub; water means for introducing water to said tub; electric motormeans connected to said washing means and effective when energized tooperate said washing means; electric water control means controllingsaid water means and efiective when energized to cause introduction ofwater to said tub; sequence control means; energizing circuits for saidmotor means, said water control means, and said sequence control meansrespectively; first, second and third switch means controlled by saidsequence control means and closed thereby for different periods of time,said first and second switch means forming together a switch assembly,at least one of said first and second switch means being closed at anyone time during said cycle, said sequence control means circuit beingconnected across a source of power through said switch assemblythroughout said cycle and opening both said first and second switchmeans at the end of said cycle, said third switch means being closedduring the period from the end of one cycle to the beginning of the nextcycle; a manual switch having at least one operative position, saidmanual switch connecting said motor means circuit and said water controlmeans circuit to said first switch means in said operative position anddisconnecting said motor means circuit and said water control meanscircuit from said first switch means when out of said operativeposition; means connecting said motor means circuit and said watercontrol means circuit to said second switch means at least during theperiod when said manual switch is out of said operative position;closure switch means having two operative positions, said closure switchmeans being moved to a first operative position when said closure meansis closed and a second operative position when said closure means isopen, said closure switch means in said first operative positionconnecting said first and second switch means to a source of power, andan additional energizing circuit for said timer motor completed throughsaid third switch means when said third switch means is closed and saidclosure switch means is in said second operative position, said timermotor opening said third switch means when said first and second switchmeans are in a position of readiness for the next cycle.

References Cited in the file of this patent UNITED STATES PATENTS2,216,388 Hampel Oct. 1, 1940 2,841,003 Conlee July 1, 1958 2,914,073Ullman Nov. 24, 1959

